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Spray foam roofs don’t stand up well to impact, so they won’t last as long as something like a tar and gravel roof and other flat roof materials in areas where extreme weather is common. Due to the reduced durability, you’ll also need more frequent maintenance and repairs for a spray foam roof, and those costs will add up over time. Spray foam roofs are relatively uncommon, so you may also struggle to hire a roofing contractor who can install one.

Hail damage is bad for a roof because it can leave the roof vulnerable to the elements. Hail may leave more than dents or scratches behind. It can actually cause the shingles to crack, which means water can leak into your home from the roof. Hail can also wear down the granules on the shingles. Without these granules, the shingles are weaker and more vulnerable to the elements, particularly wind. If the hailstorm is accompanied by high winds, it may take your shingles with it.

The common formula for measuring a roof is length x width equals square footage. Professional roofers measure the length and width of your roof, including dormers, and determine its pitch and rafter sizes. If a roof surface is a triangle, they’ll divide that square footage by two, then add up the square footage of each surface to get the total for the roof.

It’s possible to install solar panels on a tar and gravel roof, but it does increase the risk of roof leaks more than installing solar on a sloped roof would. Flat roofs pool water in heavy rain and hold onto snow longer than sloped roofs do, so all aspects of the roof will be exposed to moisture and water more readily. Adding roof penetrations to install the solar racking system will increase that risk further.